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Quiz: Test Your Anatomy IQ

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Which set of nails grows faster?

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Which set of nails grows faster?

  • Your Answer:
  • Correct Answer:

Fingernails typically grow about 3 mm per month, while toenails grow about 1 mm in that same time frame.

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A sneeze occurs at about 100 miles an hour.

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A sneeze occurs at about 100 miles an hour.

  • Your Answer:
  • Correct Answer:

Humans sneeze at a speed of up to 100 miles per hour and cough at up to 60 miles per hour.

Sweat is the main cause of body odor.

Sweat is the main cause of body odor.

  • Your Answer:
  • Correct Answer:

Sweat is basically odorless, but when it’s combined with bacteria found on the skin, it produces an odor. The medical term for abnormal body odor is “bromhidrosis.”

Approximately how many taste buds are on your tongue?

Approximately how many taste buds are on your tongue?

  • Your Answer:
  • Correct Answer:

There are about 9,000 taste buds on the tongue, but we lose taste buds as we age. The number of taste buds starts decreasing between ages 40 and 50 for women and between ages 50 and 60 for men. If any taste sensation is lost, salty and sweet tastes are usually the first to go, with bitter and sour lasting longer.

About how much does your hair grow in one year?

About how much does your hair grow in one year?

  • Your Answer:
  • Correct Answer:

Hair on the scalp grows about 6 inches a year (about 0.3 mm to 0.4 mm per day). Human hair growth – and shedding – is random and not seasonal or cyclical as it is with other mammals.

By age 60, your pupils are about one-third the size they were when you were 20.

By age 60, your pupils are about one-third the size they were when you were 20.

  • Your Answer:
  • Correct Answer:

The structures in the eye change as you age, and by age 60, your pupils are about one-third the size they were when you were 20. Your pupils also may respond more slowly to darkness or bright light.

The smallest bone in the human body is about the size of what?

The smallest bone in the human body is about the size of what?

  • Your Answer:
  • Correct Answer:

The smallest bone in the human body is the stirrup (stapes) bone, located behind your eardrum. It’s only 2.5 mm to 3.3 mm long, about the size of a grain of rice.

The smallest muscles are found in the ears.

The smallest muscles are found in the ears.

  • Your Answer:
  • Correct Answer:

The stapedius muscle is the smallest skeletal muscle in the body. This muscle helps stabilize the stapes bone as sound is transmitted to the inner ear.

What percentage of the human body is water?

What percentage of the human body is water?

  • Your Answer:
  • Correct Answer:

About 66% of the human body is water. A person can go without water for a week or longer in comfortable environmental conditions. However, in extreme heat or under physical stress, that time can be shortened to a few hours.

What is the largest organ of the human body?

What is the largest organ of the human body?

  • Your Answer:
  • Correct Answer:

Skin is the body's largest organ; the skin of a 150-pound adult male weighs about 9 pounds. Eyelids have the thinnest skin, and the soles of the feet have the thickest.

How often does your skin regenerate itself?

How often does your skin regenerate itself?

  • Your Answer:
  • Correct Answer:

Throughout your life, your skin changes constantly, regenerating itself approximately every 27 days.

Cells related to which of the following divide remarkably faster than other cells in the body?

Cells related to which of the following divide remarkably faster than other cells in the body?

  • Your Answer:
  • Correct Answer:

The living part of the hair is the deepest part of the follicle beneath the skin surface, called the bulb. The cells of the bulb divide every 23 to 72 hours, faster than any other cell in the body.

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